src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp

rev 12283 : 8169373: Work around linux NPTL stack guard error.
Summary: Also streamline OS guard page handling on linuxs390, linuxppc, aixppc.

@@ -533,21 +533,29 @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // thread stack
 
-size_t os::Posix::_compiler_thread_min_stack_allowed = 128 * K;
+// These sizes exclude OS stack guard pages, but include
+// the VM guard pages.
+size_t os::Posix::_compiler_thread_min_stack_allowed = 320 * K;
 size_t os::Posix::_java_thread_min_stack_allowed = 128 * K;
 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
 
-// return default stack size for thr_type
+// Return default stack size for thr_type.
 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
-  // default stack size (compiler thread needs larger stack)
+  // Default stack size (compiler thread needs larger stack).
   size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
   return s;
 }
 
+size_t os::Aix::default_guard_size(os::ThreadType thr_type) {
+  // Creating guard pages is very expensive. Java thread has HotSpot
+  // guard pages, so only enable libc guard pages for non-Java threads.
+  return (thr_type == java_thread ? 0 : page_size());
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // helper functions for fatal error handler
 
 void os::print_context(outputStream *st, const void *context) {
   if (context == NULL) return;